Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_4/rev/88de5e1d21c1
Author: Min-Zhong "John" Lu <mnjul@users.noreply.github.com>
Desc: Merge pull request #20791 from mnjul/bug_1027536_lockscreen_clock_stall

Bug 1022984 / Bug 1027536 - After Restarting Phone, Lockscreen Time Always Shows as 5:32 or Is Stalled. r=gweng
Conflicts:
	apps/system/js/lockscreen.js
Bumping manifests a=b2g-bump